RoundedFrameLayout - FrameLayout clipped by a rounded rectangle

RoundedFrameLayout.java

package com.example.ui.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;

import ccom.example.R;

/**
 * A not-so-efficient rounded-rectangle-clipped FrameLayout, until Android-L's clipping Outlines are
 * wideley available.
 *
 * NOTE: This doesn't support anti-aliasing, if you just need a rounded ImageView use the more
 * efficient BitmapDrawable method which does: http://evel.io/2013/07/21/rounded-avatars-in-android/
 *
 * In my case the rounded corner was to mask an image as you scrolled them in a ViewPager, so by
 * combining this with a RoundedImageView it appears anti-aliased unless actively scrolling.
 *
 * Created by richardleggett on 04/09/2014.
 */
public class RoundedFrameLayout extends FrameLayout {

    private float mCornerRadius = 12;
    private Path mPath;
    private RectF mRect;

    public RoundedFrameLayout(Context context) {
        super(context, null, 0);
        initView(null);
    }
    public RoundedFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs, 0);
        initView(attrs);
    }
    public RoundedFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView(attrs);
    }

    private void initView(AttributeSet attributes) {
        if(attributes != null) {
            TypedArray array = getContext().obtainStyledAttributes(attributes,
                    R.styleable.RoundedFrameLayout);
            if (array != null) {
                mCornerRadius = array.getDimension(R.styleable.RoundedFrameLayout_corner_radius, 0);
                array.recycle();
            }
        }

        mPath = new Path();
        mRect = new RectF();

        setWillNotDraw(false);
    }

    public void setCornerRadius(float cornerRadius) {
        mCornerRadius = cornerRadius;
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mPath.reset();
        mRect.set(0, 0, w, h);
        mPath.addRoundRect(mRect, mCornerRadius, mCornerRadius, Path.Direction.CCW);
        mPath.close();
    }

    @Override
    protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
        int count = canvas.save();
        canvas.clipPath(mPath);
        boolean result = super.drawChild(canvas, child, drawingTime);
        canvas.restoreToCount(count);
        return result;
    }
}

values.xml

<declare-styleable name="RoundedFrameLayout">
  <attr name="corner_radius" format="dimension" />
</declare-styleable>